9955966381 has 4 divisors (see below), whose sum is σ = 9956484252. Its totient is φ = 9955448512.

The previous prime is 9955966379. The next prime is 9955966453. The reversal of 9955966381 is 1836695599.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7750161225 + 2205805156 = 88035^2 + 46966^2 .

It is a cyclic number.

It is not a de Polignac number, because 9955966381 - 2¹ = 9955966379 is a prime.

It is a super-2 number, since 2×9955966381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9955966331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228940 + ... + 268933.

It is an arithmetic number, because the mean of its divisors is an integer number (2489121063).

Almost surely, 2^9955966381 is an apocalyptic number.

It is an amenable number.

9955966381 is a deficient number, since it is larger than the sum of its proper divisors (517871).

9955966381 is a wasteful number, since it uses less digits than its factorization.

9955966381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517870.

The product of its digits is 15746400, while the sum is 61.

The square root of 9955966381 is about 99779.5889999553. The cubic root of 9955966381 is about 2151.2677852540.

The spelling of 9955966381 in words is "nine billion, nine hundred fifty-five million, nine hundred sixty-six thousand, three hundred eighty-one".